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Burst Fall

Macros: BurstFall, BurstFallMod

This is the time or number of samples the burst waveform will take to fall from completely on to completely off. It is the reverse of the Rise portion and uses the same Shape, though not necessarily the same width. You will probably want Rise and Fall to be equal for most experiments, but they need not be. For example, you may wish to simulate a natural transient with a fast attack and slow decay.

Burst Fall Modulation

Normally, you can ignore the small Fall pushbutton and just use the edit portion of the control. The button opens a Burst Time Modulator dialog that allows the Fall time to be modulated, either by a sine wave source with adjustable frequency and phase, or by some other stream source. You can also set the base Fall value from that dialog (it's just a duplicate of the main Fall control), as well as the modulation depth.

When modulation is applied, the effective Fall time is equal to the sum of the base Fall value plus the modulator scaled by the modulator depth. For example, if the depth is 10% then the effective Fall ranges from 90% to 110% of its base value. If the base Fall is 100 samples, the effective Fall will then range from 90 to 110 samples.

Macro Notes:

L.1.BurstFall=100 sets Left Stream 1 Burst Fall to 100 samples, assuming Smpl mode. It will set 100 seconds in sec mode. To be safe, use a SmplSec command to set the desired mode before using this command.

L.1.BurstFall=>1 increments and L.1.BurstFall=>-1 decrements by one sample, even in sec mode. Only +/-1 sample steps are allowed.

If the Burst Dialog is open, BurstFallMod=1 opens the associated Burst Time Modulation dialog, BurstFallMod=0 closes it, and BurstFallMod=x toggles between open and closed. See further information under Burst Time Modulation.

See also Burst Application: Auditory Evoked Responses, Burst Rise/Fall vs. Spectral Width, Burst Overview, Burst Dialog Controls


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